I didn't see any drain pipe stuff at Home Depot, but then I didn't know to look for it. I'll head back there. I've been using two old yogurt cartons, but I'm looking for something that doesn't take up much volume, so I'm holding off on Rubbermaid stuff for now. Plus I'd pretty much have to be the weird guy on the security camera stuffing a foam object into every food storage container at Target. Thanks for the suggestions. +Ts